Rubio has this wrong, though not in phrasing.
There are indeed other vendors of oil around the world India could place orders to. Of course, those other vendors all have current customers. Backstabbing those customers in order to sell to India, would just send those current customers to the vendor India left — i.e. Russia.
Then there are the complexities of blends. Russia’s flow to India is NOT Urals. It is Asia-Pacific blend, out of Sakhalin. The constituent ratios of diesel/kerosene vs gasoline tends to be richer than KSA or UAE.
But regardless of the complexities, it is a world of oil scarcity. Last year global consumption lists as exceeding global production. There will always be a customer for supply. And . . . if there is not . . . that just means the asset stays underground until . . . whatever, higher prices, desperation from buyers, whatever.
The idea should be to get all of Russia’s significant oil customers and potential customers engaged in a reverse cartel. Drive the price of Russian oil down to where Russia only breaks even / makes no profit. That way the oil supply is not reduced, because Russia can’t afford to actually embargo oil.
Of course, herding cats would be easier...
One other point is that a few countries like Saudi Arabia DO have spare production capacity, tho’ it is not likely to their direct advantage to use it.